import db.py  always, that should be your first line of a function.

On Tuesday, September 24, 2013 2:55:21 PM UTC-7, Ricardo Cárdenas wrote:
>
> Derek, thanks for your suggestion. Which is the preferred way to reopen 
> the connection and define the tables?
>
> My db.py contains
>
> db = DAL(connection_string, options...)
> db.define_table('table1', Field('f1' ...), Field('f2'...))
> db.define_table(...)
> db.define_table(...)
> ...
>
> So ideally I wouldn't have to repeat this code in my script. Is it best I 
> break out the DAL/define_tables calls into a file that I import both in my 
> db.py and in my script.py?
>
>
>
> On Tuesday, September 24, 2013 4:45:09 PM UTC-5, Derek wrote:
>>
>> Each time you need to do work, you should open a new connection. You'd 
>> think there is a large overhead in creating a connection, but there isn't.
>>
>> On Tuesday, September 24, 2013 2:33:24 PM UTC-7, Ricardo Cárdenas wrote:
>>>
>>> I have a web2py app running fine on pythonanywhere. I have a minor 
>>> problem - I think I understand why it is happening, but would seek your 
>>> advice as to how best to fix it.
>>>
>>> The app itself works fine. But I also run a scheduled task using PA's 
>>> scheduler, by executing "python web2py.py -S appname -M -R 
>>> appname/private/myscript.py". The script does some processing for a few 
>>> minutes, and only then starts writing to the MySQL database.
>>>
>>> PA's MySQL database has wait_timeout set to 120 seconds. If my initial 
>>> processing is less than wait_timeout, everything works fine. But when 
>>> my initial processing exceeds wait_timeout, I get a 'Lost Connection to 
>>> MySQL' error when my code tries to write to the database. I am using 
>>> connection pooling in the call to the DAL, but I guess the connection 
>>> instantiated by db.py file is not automatically kept warm nor is it 
>>> automatically replaced by another good connection when it expires.
>>>
>>> What's the best practice here:
>>>
>>>    - Is there a preferred way to ping the database every once in a 
>>>    while?
>>>    - Is there a preferred way to detect an expired DAL connection, and 
>>>    to request another one?
>>>
>>> Thanks for any suggestions or pointers. Sorry if this is in the docs, 
>>> couldn't find it. warm regards -Ricardo
>>>
>>>

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